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From: Olga Kornievskaia <>
To: linux-rdma <>
Subject: Help understand use of MAC address resolution in RDMA
Date: Thu, 5 Aug 2021 10:38:42 -0400	[thread overview]
Message-ID: <> (raw)

Hi folks,

Can somebody help me understand how RoCE (this is probably RDMA core
and not specific to RoCE but I'm not sure) manages destination MAC
addresses for its connection?

Specifically the problem being observed is a server initiates an RDMA
CM disconnect (client replies), client tries to reconnect. Server
sends an ARP advertising a different MAC for the IP that the RDMA
connection was using. RDMA code keeps sending the RDMA CM connect
message to the old MAC for a certains period of time (90-100sec) then
it finally sends it to the new MAC address.

Question: how does the core RDMA layer manage the MAC address for the
connection. Why does it seem like it ignores the ARP updates?

Thank you.

             reply	other threads:[~2021-08-05 14:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05 14:38 Olga Kornievskaia [this message]
2021-08-06  1:44 ` Help understand use of MAC address resolution in RDMA Jason Gunthorpe
2021-08-06  2:05   ` Olga Kornievskaia

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